[scilab-Users] Quiver on an image (SIVP toolbox)

[Peter von Niederhaeusern]

hold on (or _hold on) uses the "default" plotting context of Scilab
and plots subsequent plots
onto the same "canvas"...

But what about different contexts? imshow from the SIVP toolbox uses
Tk to show images.
I don't think one can overlay plots from the Scilab context onto Tk, right?

Are there any alternatives for mixing?

I'd like to draw the quiver field onto the image to show the meaning
of the difference vectors of
a tracked object (the image).

On Tue, Jul 13, 2010 at 8:13 PM, Stephane Mottelet
<stephane.mottelet at utc.fr> wrote:
> Peter von Niederhaeusern <pvonnied at gmail.com> a écrit :
>
>> Yes. I've found out the cause for this: the scale factor ;-)
>> Now the quiver plot looks exactly as in the Matlab example.
>>
>> Remaining problem: plot the quiver on the image...
>
> use "hold on"
>
>>
>> On Tue, Jul 13, 2010 at 2:30 PM, Stephane Mottelet
>> <stephane.mottelet at utc.fr> wrote:
>>>
>>> Peter von Niederhaeusern <pvonnied at gmail.com> a écrit :
>>>
>>>> Hi all,
>>>>
>>>> We are to convert scripts from Matlab to Scilab 5.2.2.
>>>>
>>>> One task of this conversion is to plot a quiver (we use plotlib)
>>>> on an image of a moving car (difference image, displacement, object
>>>> tracking...).
>>>>
>>>> The SIVP toolkit uses a Tk widget to display an image and quiver uses
>>>> internal means of Scilab: is it possible to combine the two?
>>>>
>>>> BTW: are there any significant differences between the quiver command of
>>>> Matlab
>>>> and the _quiver command of plotlib? Our results differ heavily...
>>>
>>> Hi. the graphical results should only differ concerning arrow
>>> size, not direction. Is it the case ?
>>>
>>> S.
>>>
>>>>
>>>> Merci,
>>>> Peter
>>>>
>>>
>>>
>>>
>>
>
>
>